Secondary phases in AlxCoCrFeNi high-entropy alloys: An in-situ TEM heating study and thermodynamic appraisal

Rao, J. C.; Diao, H. Y.; Ocelík, V.; Vainchtein, D.; Zhang, C.; Kuo, C.; Tang, Z.; Guo, W.; Poplawsky, J. D.; Zhou, Y.; Liaw, P. K.; De Hosson, J. Th. M.

doi:10.1016/j.actamat.2017.03.066

Title: Secondary phases in Al_xCoCrFeNi high-entropy alloys: An in-situ TEM heating study and thermodynamic appraisal

Journal Article · 27 March 2017 · Acta Materialia

DOI: https://doi.org/10.1016/j.actamat.2017.03.066 · OSTI ID:1352800

Rao, J. C. ^[1]; Diao, H. Y. ^[2]; Ocelík, V. ^[3]; Vainchtein, D. ^[3]; Zhang, C. ^[4]; Kuo, C. ^[2]; Tang, Z. ^[2]; Guo, W. ^[5]; Poplawsky, J. D. ^[5]; Zhou, Y. ^[6]; Liaw, P. K. ^[2]; De Hosson, J. Th. M. ^[3]

Harbin Inst. of Technology (China). School of Materials Science and Engineering. Inst. for Advanced Ceramics; Univ. of Groningen (Netherlands). Zernike Inst. for Advanced Materials. Dept. of Applied Physics; Univ. of Maryland, College Park, MD (United States). Maryland NanoCenter
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
Univ. of Groningen (Netherlands). Zernike Inst. for Advanced Materials. Dept. of Applied Physics
CompuTherm, LLC, Middleton, WI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
Harbin Inst. of Technology (China). School of Materials Science and Engineering. Inst. for Advanced Ceramics

Secondary phases, either introduced by alloying or heat treatment, are commonly present in most high-entropy alloys (HEAs). Understanding the formation of secondary phases at high temperatures, and their effect on mechanical properties, is a critical issue that is undertaken in the present paper, using the Al_xCoCrFeNi (x = 0.3, 0.5, and 0.7) as a model alloy. The in-situ transmission-electron-microscopy (TEM) heating observation, an atom-probe-tomography (APT) study for the reference starting materials (Al_0.3 and Al_0.5 alloys), and thermodynamic calculations for all three alloys, are performed to investigate (1) the aluminum effect on the secondary-phase fractions, (2) the annealing-twinning formation in the face-centered-cubic (FCC) matrix, (3) the strengthening effect of the secondary ordered body-centered-cubic (B2) phase, and (4) the nucleation path of the σ secondary phase thoroughly. Finally, the present work will substantially optimize the alloy design of HEAs and facilitate applications of HEAs to a wide temperature range.

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Research Organization:: Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Groningen (Netherlands); Harbin Institute of Technology (China)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Army Research Office (ARO); Royal Netherlands Academy of Science (Netherlands); National Natural Science Foundation of China (NSFC); USDOE Office of Fossil Energy and Carbon Management (FECM)

Contributing Organization:: Univ. of Maryland, College Park, MD (United States); CompuTherm, LLC, Middleton, WI (United States)

Grant/Contract Number:: FE0024054; FE0008855; FE0011194; AC05-00OR22725; DMR-1611180; W911NF-13-1-0438; 11CDP003; 51572054; 51021002; 51321061; FE-0008855; FE-0024054

OSTI ID:: 1352800

Alternate ID(s):: OSTI ID: 1398724

Journal Information:: Acta Materialia, Vol. 131; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 256 works

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36 MATERIALS SCIENCE
High-entropy alloy
Secondary phases
In-situ heating TEM
Atom-probe-tomography
Thermodynamic calculations

Title: Secondary phases in AlxCoCrFeNi high-entropy alloys: An in-situ TEM heating study and thermodynamic appraisal

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Title: Secondary phases in Al_xCoCrFeNi high-entropy alloys: An in-situ TEM heating study and thermodynamic appraisal